How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 5/2100.0*Chance wins title100.0*Average seed
Atlético Madrid 1 Rayo Vallecano 0 +20.5
+0.4
Real Betis 0 Barcelona 2 -14.9
-0.2
Real Sociedad 0 Real Madrid 1 -6.4
-0.2
Week of 5/13None
Week of 5/15100.0*Chance wins title100.0*Average seed
Atlético Madrid 2 Celta de Vigo 0 +0.4
Deportivo 0 Real Madrid 2 -0.2
Points
Chance Will Win Championship